date! ,

Monthly Total Heating Degree Days

(a vali)

Base Temperature = 65 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201304
a = 1 day missing, b = 2 days missing, c = 3 days, ..etc..,
z = 26 or more days missing, A = Accumulations present
Long-term means based on columns; thus, the monthly row may not
sum (or average) to the long-term annual value.
Months with 5 missing days or less use mean for missing day(s)
Individual Months not used for annual or monthly statistics if more than 5 days are missing.
Individual Years not used for annual statistics if any month in that year has more than 5 days missing.
YEAR(S JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
1927 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1928 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1929 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1930 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1931 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1932 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1933 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1934 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 90.50 386.00 526.47 b 989.00 1781.00 3772.97
1935 2147.00 1215.41 a 1285.50 798.50 395.50 183.50 2.50 79.50 330.50 659.50 1475.50 1727.50 10300.41
1936 2315.70 a 2258.50 1318.53 a 932.50 199.50 117.50 18.08 a 143.00 360.00 a 854.57 a 828.50 k 1608.00 10125.88
1937 2347.00 1660.08 b 1338.50 861.00 234.00 8.50 m 17.57 a 69.00 231.00 736.50 0.00 z 0.00 z 7494.64
1938 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 158.50 0.00 z 0.00 z 0.00 z 0.00 z 1330.56 c 1607.50 3096.56
1939 1819.50 1975.00 1051.00 f 585.00 g 270.73 a 162.41 a 0.00 36.00 266.38 a 801.87 a 886.80 e 1266.72 b 7485.42
1940 1900.09 b 1484.91 b 1451.32 a 855.00 a 334.28 a 127.76 a 19.00 57.50 141.96 b 451.57 a 1260.50 1500.92 a 9584.80
1941 1786.63 a 1577.50 1356.25 e 671.00 266.08 a 112.00 24.50 54.50 309.50 659.50 1126.03 a 1485.50 9429.00
1942 1537.00 1584.59 a 1148.03 a 646.55 a 444.00 153.50 28.50 45.50 367.50 554.50 1241.00 1870.00 9620.68
1943 2175.17 a 1536.50 1553.00 685.50 464.50 174.50 2.00 26.50 306.50 529.50 1125.50 1481.80 a 10060.97
1944 1454.00 1657.50 1545.00 714.00 256.04 d 121.50 17.00 45.00 234.50 556.50 1053.00 1613.00 9267.04
1945 1769.50 1526.00 993.00 879.00 602.00 202.50 43.00 103.00 450.50 688.00 1356.00 1840.88 a 10453.38
1946 1898.00 1729.00 1086.00 0.00 z 429.50 117.50 20.00 74.50 305.00 757.00 1227.00 1819.70 a 9463.20
1947 1677.50 1660.50 1284.50 763.00 500.50 193.50 52.50 45.00 387.00 508.50 1329.50 1780.50 10182.50
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 37.00 11.00 87.50 531.50 1114.50 1752.00 3533.50
1949 1989.50 1878.00 1414.00 576.00 269.00 79.50 31.00 a 35.50 275.00 670.93 c 966.21 a 1793.35 a 9977.99
1950 2373.50 1691.93 a 1448.50 1023.00 440.72 a 113.28 a 37.50 107.98 a 253.33 c 598.82 a 1339.50 1818.31 b 11246.36
1951 1948.87 a 1548.50 1597.10 e 499.50 m 214.93 a 151.55 a 41.33 a 64.67 b 347.59 a 736.52 b 1330.00 c 0.00 z 7981.06
1952 0.00 z 0.00 z 0.00 z 46.50 r 294.00 43.45 a 23.77 a 39.50 183.00 678.50 1016.38 a 1450.00 3728.59
1953 1765.50 1457.50 1248.86 c 802.50 350.50 105.52 a 21.50 13.95 a 258.50 411.50 929.46 b 1518.00 8883.29
1954 2149.50 1071.26 a 1258.17 b 815.17 a 468.00 114.50 25.32 a 47.50 290.69 a 621.55 a 950.00 1388.80 a 9200.46
1955 1861.50 1681.08 b 1638.50 482.50 246.45 a 73.45 a 10.50 5.00 283.50 579.70 a 1428.50 1954.50 10245.18
1956 1901.33 a 1729.00 1497.00 973.97 a 390.71 b 28.97 a 34.00 30.50 349.00 499.50 1076.90 a 1653.85 a 10164.72
1957 0.00 z 1544.15 a 1246.00 710.89 b 294.00 140.50 3.00 42.00 319.50 612.25 a 1146.96 b 1461.28 b 7520.53
1958 1517.50 1527.00 1127.22 b 604.00 246.00 162.41 a 45.50 81.50 227.00 563.00 1161.50 1877.00 9139.64
1959 2076.00 1660.30 a 1209.00 720.00 391.50 68.00 12.50 9.50 265.00 869.50 1386.00 1311.00 9978.30
1960 1852.50 1593.50 1520.00 772.76 a 303.50 85.34 a 13.50 10.50 177.00 566.00 1109.50 1721.50 9725.60
1961 1823.00 1363.19 a 1086.50 849.50 355.00 32.40 e 15.00 0.50 327.50 566.02 b 1078.50 1861.00 9358.10
1962 1964.50 1758.50 1407.00 864.50 367.50 58.50 14.00 21.50 288.00 439.17 a 1009.00 1583.00 9775.17
1963 1995.00 1555.00 1109.50 669.50 381.00 41.50 8.50 21.50 133.50 268.00 992.00 1802.50 8977.50
1964 1637.50 1410.50 1475.50 675.50 238.00 166.00 8.50 111.50 328.00 580.00 1076.50 1921.00 9628.50
1965 2017.07 a 1585.11 a 1575.50 745.00 346.50 71.50 28.00 71.50 505.50 524.00 1255.00 1474.50 10199.18
1966 2331.50 1733.00 1194.50 852.00 447.00 115.00 2.50 67.00 210.50 654.50 1354.00 1758.50 10720.00
1967 1829.00 1788.00 1317.00 866.00 499.50 77.00 32.00 63.50 145.00 662.00 1109.50 1601.50 9990.00
1968 1899.50 1689.00 1070.50 675.50 425.00 113.00 45.50 100.00 230.50 623.50 1051.50 1733.93 a 9657.43
1969 2132.00 1536.00 1508.50 637.00 339.00 252.00 42.00 9.00 248.00 811.50 1089.00 1540.00 10144.00
1970 2035.50 1596.50 1624.50 869.00 440.50 39.50 11.00 35.50 256.50 607.50 1165.00 1832.62 a 10513.62
1971 2138.00 1474.00 1302.50 726.00 331.00 40.00 59.50 31.00 258.50 573.50 1204.00 1720.50 9858.50
1972 2017.00 1781.00 1328.50 765.00 a 209.00 70.00 39.50 39.00 330.00 735.50 1237.00 1897.00 10448.50
1973 1606.50 1413.50 939.30 a 720.00 303.00 70.50 26.50 4.50 263.00 457.50 1286.50 1784.00 8874.80
1974 2116.30 c 1594.00 1471.50 778.00 443.00 77.50 0.50 98.17 a 341.00 574.00 1108.50 1409.00 10011.47
1975 1722.00 1609.50 1461.00 853.50 295.50 104.00 15.00 l 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 6045.50
1976 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 6.00 n 28.50 200.00 747.00 1156.50 1884.50 4016.50
1977 2023.50 1311.85 a 1020.00 473.00 68.50 4.00 w 33.00 168.00 309.50 587.00 1225.00 1915.50 9134.85
1978 2182.50 1777.48 a 1384.50 772.50 235.50 139.00 44.00 116.00 242.00 648.00 1375.00 1906.00 10822.48
1979 2286.00 2006.50 1556.00 1082.50 580.50 128.00 22.50 128.00 269.50 730.50 1190.50 1454.50 11435.00
1980 1956.00 1696.50 1494.50 542.00 238.00 115.50 27.00 123.50 385.00 751.00 985.00 1730.83 a 10044.83
1981 1670.50 1361.00 1056.50 678.50 396.00 124.00 36.00 20.50 312.50 711.00 881.00 1700.50 8948.00
1982 2368.50 1605.50 1364.50 825.00 321.00 260.50 20.00 136.50 334.50 686.00 1275.50 1495.50 10693.00
1983 1596.00 1379.00 1285.50 808.50 508.50 139.50 31.00 11.00 334.50 711.50 1078.50 2092.00 9975.50
1984 1782.50 1215.50 1401.50 628.50 459.00 106.50 29.00 34.50 404.50 673.50 1236.50 1890.50 9862.00
1985 1904.00 1715.00 1100.00 620.50 267.00 273.10 a 58.00 164.00 431.00 738.50 1590.50 2003.63 a 10865.24
1986 1646.74 b 1624.00 1147.00 740.00 316.00 101.50 19.50 114.00 367.00 679.50 1410.50 1507.50 9673.24
1987 1604.00 1219.00 1317.00 498.00 254.00 80.00 37.00 108.50 239.50 800.50 983.50 1428.00 8569.00
1988 1960.00 1696.00 1232.00 695.50 261.50 28.50 9.50 34.50 309.50 761.00 1206.00 1657.00 9851.00
1989 1855.00 1839.50 1595.00 853.50 277.50 129.50 3.50 72.50 287.00 680.50 1339.00 1977.00 10909.50
1990 1552.50 1591.50 1231.50 773.50 438.50 105.50 50.50 48.50 238.50 725.00 1142.50 1825.00 9723.00
1991 1987.00 1320.50 1237.00 606.50 296.00 36.00 31.50 20.50 328.00 882.50 1388.00 1575.00 9708.50
1992 1630.00 1455.50 1172.00 870.00 321.00 185.50 158.00 128.50 391.00 736.50 1222.50 1895.50 10166.00
1993 1968.50 1604.50 1283.50 729.00 379.00 201.00 101.00 77.00 417.50 798.50 1269.50 1652.50 10481.50
1994 2297.00 1848.00 1118.50 744.00 310.50 69.50 59.00 108.50 215.00 566.50 1086.00 1589.50 10012.00
1995 1872.50 1605.00 1364.50 927.00 450.00 65.00 47.00 28.00 313.00 731.00 1459.66 a 1859.00 10721.66
1996 2210.50 1719.50 1614.00 1041.00 459.00 112.50 45.50 33.50 307.50 704.50 1593.50 1964.50 11805.50
1997 2108.50 1558.50 1544.50 988.00 0.00 z 43.00 0.00 z 87.50 231.00 739.50 0.00 z 1287.00 8587.50
1998 1893.00 1206.00 1391.00 597.50 293.00 210.50 52.00 25.50 207.00 692.50 1185.00 1630.00 9383.00
1999 2053.00 1363.50 1202.00 712.50 366.50 164.00 57.00 93.50 376.50 780.00 945.50 1438.00 9552.00
2000 1906.50 1337.50 1025.00 792.50 363.50 214.00 54.50 67.50 380.00 673.50 1260.00 2165.00 10239.50
2001 1701.00 1835.00 1321.00 782.00 319.50 161.00 62.00 56.50 327.00 783.00 924.00 1554.50 9826.50
2002 1688.00 1339.00 1657.00 869.00 594.50 101.00 20.50 78.00 280.50 1006.50 1245.50 1469.00 10348.50
2003 1824.00 1783.50 1466.00 721.00 342.00 114.50 26.00 38.50 287.00 595.50 1343.50 1477.00 10018.50
2004 2128.50 1550.00 1276.50 754.00 548.00 199.50 78.50 201.00 230.00 681.00 955.00 1660.50 10262.50
2005 2049.50 1527.50 1436.50 572.50 462.00 89.50 57.50 72.00 205.00 624.50 1067.50 1496.50 9660.50
2006 1389.00 1686.50 1379.00 524.50 337.50 50.00 11.00 23.50 280.50 773.00 1180.50 1478.50 9113.50
2007 1752.50 0.00 z 1263.50 759.00 336.00 89.00 18.00 103.00 282.50 587.50 1126.50 1855.00 8172.50
2008 1911.50 1837.50 1424.50 797.00 472.50 132.50 36.50 37.50 271.00 625.50 1133.00 1996.50 10675.50
2009 2072.50 1633.00 1489.50 824.00 509.00 177.50 0.00 z 0.00 z 0.00 z 811.50 883.00 1827.50 10227.50
2010 1821.00 1669.00 1089.00 487.50 350.00 118.00 10.50 49.00 356.50 516.00 1154.50 1774.50 9395.50
2011 1989.00 1590.50 1440.00 749.50 434.00 124.00 16.53 a 22.70 c 238.00 554.50 1065.50 1406.50 9630.73
2012 1552.50 1378.00 953.50 639.00 318.00 87.93 a 3.00 38.00 294.50 754.00 1272.50 1758.00 9048.93
2013 1866.00 1623.00 1655.40 a 52.50 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 5144.40
Period of Record Statistics
MEAN 1913.33 1589.78 1330.06 750.86 359.59 118.87 31.23 62.38 291.34 656.47 1176.11 1687.89 9953.00
S.D. 232.12 201.58 184.87 132.94 102.79 56.53 24.83 43.54 75.70 121.24 163.52 201.70 644.22
SKEW 0.00 0.12 -0.16 0.05 0.18 0.56 2.15 0.87 0.02 -0.18 0.29 -0.02 0.35
MAX 2373.50 2258.50 1657.00 1082.50 602.00 273.10 158.00 201.00 505.50 1006.50 1593.50 2165.00 11805.50
MIN 1389.00 1071.26 939.30 473.00 68.50 28.50 0.00 0.50 87.50 268.00 881.00 1266.72 8569.00
NO YRS 74 74 74 71 74 74 73 76 76 77 75 76 63